Suppose you are facing a tall makeup mirror on a vertical wall. Fluorescent tubes framing the mirror carry a clockwise electric current. What is the direction of the field the current creates at a point on the wall outside the frame to the right?
1.left
2.right
3.horizontally toward you
4.horizontally away from you
5.no direction because the field has zero magnitude
3
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A car of mass m1 traveling at velocity v passes a car of mass m2 parked at the side of the road. The momentum of the system of two cars is
A.
B.
C.
D.
E.
What is conserved when a photon collides with an electron?
A) momentum B) energy C) both of these D) neither of these
The origin of Earth's primitive ozone layer
A) is attributed to photosynthesis. B) traces back to the Cambrian period. C) is attributed to volcanic eruptions. D) helped to form the oceans.
Copernicus
A) provided strong observational evidence that the Earth moved about the Sun B) proved that the orbital shapes of the planets were ellipses and not circles C) was the first person to suggest the Earth moved around the Sun D) revived Aristarchus's suggestion of a Sun-centered solar system and described it mathematically